Lab Exam Notes: Lab 5- Muscular System Part 2

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University of Toronto Scarborough
Biological Sciences
Connie Soros

LAB 5 – MUSCULAR SYSTEM PART 2 MUSCLE ORIGIN INSERTION ACTION/FUNCTION Triceps Brachii, Medial head - - Extends the elbow Serratus Ventralis In many parts of the ribs scapula Stabilize scapula, especially for pushing or punching movements of the arm Subcapularis - - -Attaches to the humerus - medial rotator of the humerus MEDIAL FORELIMB MUSCLES Brachialis Radius Ulna Assists in flexing the elbow Biceps Brachii Scapula Proximal ends of the Radius Primary flexor of the lower and Ulna forelimb Extensor carpi radialis - - Flexing the elbow Humerus - - - Radius - - - Coracobrachialis Coracoid process of the humerus Adductor of the forelimb scapula Flexor Carpi Radialis Distal humerus and proximal - Flex the carpals, metacarpals Flexor Digitorum Profundus radius and digits Palmaris Longis Flexor Carpi Ulnaris BACK MUSCLES Splenius 1st two thoracic vertebrae Occipital bone of the head Extends the head and flexes it to the side Rhomboideus Capitus Occipital area Scapula - most anterior of the 3 - draws the scapula forward Rhomboideus Cervicus Cervical vertebrae Scapula - middle Rhomboideus Thoracis Thoracic Vertebrae Scapula - assists other two in holding the scapula in place and drawing it forward Extensor Dorsi Communis - - Extends the spine LATERAL LEG
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